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ftrace: Use fls() to get the bits for dup_hash()

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The effect here is to get the number of bits, lets use fls() to do
this job.

Link: https://lkml.kernel.org/r/20200831031104.23322-3-richard.weiyang@linux.alibaba.com

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Wei Yang 2020-08-31 11:11:00 +08:00 committed by Steven Rostedt (VMware)
parent 8db4d6bfbb
commit 59e65b3358
1 changed files with 3 additions and 2 deletions
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5
kernel/trace/ftrace.c
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@ -1370,8 +1370,9 @@ static struct ftrace_hash *dup_hash(struct ftrace_hash *src, int size)
/*
* Make the hash size about 1/2 the # found
*/
for (size /= 2; size; size >>= 1)
bits++;
bits = fls(size);
if (bits)
bits--;
/* Don't allocate too much */
if (bits > FTRACE_HASH_MAX_BITS)